Next time BBC2 want to do one of those periodic “what happened to the white working class” documentaries, they could do worse than come to a Pendulum gig. The crowd at Wembley Arena last night were defiantly not “studenty” as many for post-rave music acts can be, and neither were they multicultural; in fact, switch the haircuts and outfits around and you could pretty much transplant the same set of people back 30-odd years to an early Iron Maiden show. This was a 21st century heavy metal crowd through-and-through – not fashionable, not refined, but ready to get involved to the maximum extent possible.